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金子为什么是金色，而不是普通金属的银色？ - 知乎
source link: https://www.zhihu.com/question/22328917/answer/619197656
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你可能会想：“这个问题应该不难吧，我书读的少，也参加过高考，虽然它不考。但科学史上应该很早就能解释…
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